Cyclic Redundancy Check Controller (CRC) Module Very Slow Operation

Hi Tony,

This question has been forwarded to respective expert .

I'll get back to you as soon as I hear the response.

Best Regards,

Pratip

Thanks Pratip,

Since posting, I have spotted that I do not toggle the Channel 1 PSA Signature Register reset bit in CRC_CTRL0, so, for completeness, here is my latest code.

uint16 HwCrc_CalculateCrc16From32bit( const uint32 nCrcDataPtr[], const uint16_least nCrcLength, const uint16 nCrcStartValue)
    uint16_least nIdx;
    regCrc.CRC_CTRL0 = 0x00000001U;                 /* CRC Global Control Register 0 */
    regCrc.CRC_CTRL0 = 0x00000000U;                 /* CRC Global Control Register 0 */
    regCrc.CRC_CTRL2 = 0x00000000U;                 /* CRC Global Control Register 2 */
    /* Write seed */
    regCrc.PSA_SIGREGL1 = (uint32)nCrcStartValue;   /* Channel 1 PSA signature low register */
    regCrc.CRC_CTRL2 = 0x00000003U;                 /* CRC Global Control Register 2 */
    /* Write each part of data block to PSA signature register */
    for(nIdx = 0U; nIdx < nCrcLength; nIdx++)
    {
        regCrc.PSA_SIGREGL1 = (uint32)((uint16)nCrcDataPtr[nIdx]);   /* Channel 1 PSA signature low register */
    }
    return (uint16)regCrc.PSA_SIGREGL1; /* Channel PSA signature low register contains the LS 32 bits of the answer. We are only taking the LS 16 bits */
}

I think the problem with speed is largely related to the for loop, but as I described, a checksum type addition within the loop instead of writing to PSA_SIGREGL1 was quicker.

Note that our team's original query on CRC was addressed by Frank Noha in post http://e2e.ti.com/support/microcontrollers/tms570/f/312/p/90947/319409.aspx#319409.

Regards, Tony.

Hello:

Were you able to solve the slow CRC issue?

Regards,

Enrique

Hi Enrique,

I'm using DMA now to drive my CRC so do not have this problem anymore. I haven't closed the post as, even thought I'm no longer interested, I thought TI might be interested in looking at it. If you want to close the post, then that's fine by me, bit I wouldn't regard it as answered.

Regards, Tony.

Hello all,

I have the same problem here. I use the similar ways of CRC function as Tony did initilally. And I need more than 10ms to calculate the CRC of data stocked in the 1M flash zone. The micro in use is TMS570ls2125.

Is there any other way instead of using DMA to get CRC more quickly?